/* SXF GPT-Realtime-2.1 independent guide: isolated responsive component namespace */
:root{color-scheme:dark}html{scroll-behavior:smooth;scroll-padding-top:86px}body.r21-page{margin:0;background:#07101b;color:#d9e6f0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.75;overflow-x:hidden}body.r21-page *{box-sizing:border-box}body.r21-page a{color:#8bddff;text-decoration-color:rgba(135,211,253,.34);text-underline-offset:3px}body.r21-page a:hover{color:#dcf7ff}body.r21-page a:focus-visible,body.r21-page button:focus-visible,body.r21-page input:focus-visible,body.r21-page summary:focus-visible{outline:3px solid #9fe8fa;outline-offset:3px}body.r21-page h1,body.r21-page h2,body.r21-page h3{color:#f4faff;line-height:1.2;letter-spacing:-.025em}body.r21-page h2{font-size:clamp(1.55rem,2.7vw,2.3rem);margin:.2rem 0 1.35rem}body.r21-page h3{font-size:1.17rem;margin:1.7rem 0 .5rem}body.r21-page p{margin:.7rem 0 1.2rem}body.r21-page strong{color:#f1f8ff}body.r21-page code{color:#a7edf9;font-size:.91em}body.r21-page img{max-width:100%;height:auto;display:block}body.r21-page figure{margin:0}body.r21-page li{margin:.38rem 0}body.r21-page small{font-size:.78rem}body.r21-page ::selection{background:#176990;color:#fff}.r21-shell{width:min(1230px,calc(100% - 48px));margin:0 auto}.r21-skip{position:absolute;left:-9999px;top:10px;z-index:1000;background:#fff;color:#07101b!important;padding:12px}.r21-skip:focus{left:15px}.r21-header{position:sticky;top:0;z-index:50;background:rgba(7,16,27,.94);border-bottom:1px solid #20364a;backdrop-filter:blur(16px)}.r21-nav{width:min(1230px,calc(100% - 48px));margin:auto;min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:16px}.r21-logo{white-space:nowrap;font-weight:850;font-size:1.32rem!important;letter-spacing:-.075em;text-decoration:none!important;color:#f7fdff!important}.r21-logo span{font-weight:400;letter-spacing:-.03em;color:#b4e9ff}.r21-nav-links{display:flex;align-items:center;gap:clamp(10px,2.4vw,28px);overflow-x:auto;scrollbar-width:none}.r21-nav-links a{font-size:.83rem;white-space:nowrap;text-decoration:none!important;color:#b8cad8!important}.r21-nav-links a[aria-current]{color:#d1f677!important}.r21-crumb{font-size:.75rem;color:#9db1c1;display:flex;gap:10px;align-items:center;padding-top:22px;flex-wrap:wrap}.r21-crumb a{color:#b5cbd8!important;text-decoration:none}.r21-hero{display:grid;grid-template-columns:minmax(0,1.03fr) minmax(0,.97fr);gap:32px;align-items:center;padding-top:44px;padding-bottom:76px}.r21-kicker,.r21-eyebrow{font-size:.69rem;line-height:1.4;font-weight:800;letter-spacing:.16em;color:#b4e47e!important;text-transform:uppercase}.r21-led{width:7px;height:7px;background:#ccff5a;display:inline-block;border-radius:50%;box-shadow:0 0 14px #ccff5a;margin-right:9px}.r21-hero h1{font-size:clamp(2.25rem,4.25vw,4.45rem);line-height:1.07;margin:21px 0;color:#f6fbff;max-width:15ch}.r21-hero h1 em{font-style:normal;color:#b9edf9}.r21-lead{font-size:clamp(1rem,1.28vw,1.2rem);line-height:1.7;color:#b7c9d9;max-width:64ch}.r21-hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:25px 0}.r21-btn{min-height:48px;display:inline-flex;align-items:center;justify-content:center;text-align:center;gap:9px;padding:12px 20px;font-size:.83rem;font-weight:750;border-radius:11px;text-decoration:none!important;cursor:pointer;border:1px solid #456174;transition:transform .18s,background .18s}.r21-btn:hover{transform:translateY(-2px)}.r21-primary{background:#bfe76b;border-color:#bfe76b;color:#07101b!important}.r21-primary:hover{background:#d4fb87;color:#07101b!important}.r21-secondary{background:#132337;color:#dbe8f1!important}.r21-secondary:hover{background:#19314a;color:#fff!important}.r21-date{font-size:.75rem;color:#90aabe!important}.r21-hero-media{border:1px solid #305477;border-radius:22px;background:radial-gradient(circle at 46% 12%,#164263,#071320 72%);padding:10px;box-shadow:0 22px 90px #0009;overflow:hidden}.r21-hero-media img{width:100%;aspect-ratio:16/9;object-fit:contain;border-radius:14px}.r21-hero-media figcaption{font-size:.67rem;color:#98b9cb;text-align:center;padding:7px}.r21-body-layout{display:grid;grid-template-columns:215px minmax(0,1fr);gap:clamp(40px,6vw,90px);align-items:start}.r21-aside{min-width:0}.r21-sticky{position:sticky;top:86px;border-left:1px solid #24435a;padding:8px 0 18px 18px}.r21-sticky>span{font-size:.72rem;color:#c6ed80;font-weight:800;letter-spacing:.12em}.r21-sticky nav{display:grid;gap:1px;margin-top:12px}.r21-sticky nav a{padding:6px 2px;text-decoration:none!important;color:#a6bdcd!important;font-size:.78rem;line-height:1.45}.r21-sticky nav a:hover{color:#e1faee!important}.r21-aside-resource{display:block;margin-top:14px;border-top:1px solid #294057;padding-top:15px;font-size:.75rem}.r21-article{max-width:855px;min-width:0}.r21-section{padding:50px 0 58px;border-top:1px solid #1d3448;scroll-margin-top:80px}.r21-section:first-of-type{padding-top:0;border-top:0}.r21-section>p{max-width:79ch;color:#bbcad8}.r21-answer{background:linear-gradient(122deg,#132d40,#0a1929);border:1px solid #345368;border-left:4px solid #c1ef73;padding:23px 27px;border-radius:13px;font-size:1.05rem}.r21-answer p{margin:.4rem 0 1rem}.r21-statgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:20px 0}.r21-statgrid>div{border:1px solid #2b4559;background:#101f2f;padding:18px;border-radius:12px;display:grid;gap:5px}.r21-statgrid span,.r21-statgrid small{font-size:.69rem;color:#9ab7c8}.r21-statgrid strong{font-size:1.6rem;color:#e4f8ff}.r21-steps{counter-reset:item;list-style:none;padding:0;display:grid;gap:12px}.r21-steps li{counter-increment:item;position:relative;padding:16px 17px 16px 62px;background:#0e2030;border:1px solid #243e51;border-radius:12px}.r21-steps li:before{content:counter(item,decimal-leading-zero);position:absolute;left:16px;top:16px;color:#c9f47d;font-size:.86rem;font-weight:850}.r21-note,.r21-reviewed{border-left:3px solid #426c80;padding:10px 16px;color:#aabccc!important;background:#0c1a29}.r21-card{background:#101e2e;border:1px solid #2a4357;border-radius:14px;padding:22px;margin:17px 0}.r21-card h3{margin-top:0}.r21-card p{margin-bottom:.4rem}.r21-prompt{border:1px solid #34566d;border-radius:13px;overflow:hidden;background:#081522;margin:18px 0}.r21-code-head{display:flex;justify-content:space-between;gap:10px;align-items:center;background:#183148;padding:10px 15px;color:#c9e0ed;font-size:.75rem}.r21-code-head button{background:#c7e97d;color:#061421;border:0;border-radius:7px;padding:7px 12px;font-size:.77rem;font-weight:750;cursor:pointer}.r21-prompt pre{padding:18px 21px;overflow:auto;margin:0;white-space:pre;font-size:.78rem;line-height:1.62;tab-size:2}.r21-prompt code{color:#d7e7f1!important}.r21-table-wrap{overflow-x:auto;border:1px solid #294257;border-radius:12px;margin:20px 0;scrollbar-color:#5b8fa4 #081724}.r21-table-wrap:focus-visible{outline:2px solid #b1edf8}.r21-table-wrap table{border-collapse:collapse;width:100%;min-width:660px;font-size:.82rem;line-height:1.55;text-align:left}.r21-table-wrap caption{caption-side:top;text-align:left;padding:12px 14px;color:#9cbaca;font-size:.74rem;background:#102334}.r21-table-wrap th,.r21-table-wrap td{padding:13px 14px;border-bottom:1px solid #2a3e51;border-right:1px solid #1f3245;vertical-align:top}.r21-table-wrap thead{background:#1b3448;color:#f1f9ff}.r21-table-wrap tbody th{color:#ecf4fb}.r21-table-wrap tbody tr:nth-child(even){background:#102233}.r21-feature-figure{margin:20px 0 30px!important;border:1px solid #284e67;border-radius:15px;background:#061321;padding:7px}.r21-feature-figure img{width:100%;border-radius:10px}.r21-feature-figure figcaption{padding:10px 12px;font-size:.76rem;color:#a4bfce}.r21-choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.r21-choice-grid .r21-card{margin:0}.r21-tag{color:#d0f383;font-size:.72rem;letter-spacing:.13em;font-weight:800}.r21-lab-cta{display:flex;align-items:center;justify-content:space-between;gap:18px;background:linear-gradient(120deg,#1e3a45,#0f2633);border:1px solid #52775c;border-radius:13px;padding:20px 22px;margin:24px 0}.r21-lab-cta h3{margin:0}.r21-lab-cta p{margin:5px 0;color:#a9c5cd;font-size:.85rem}.r21-calc{border-radius:17px;background:#111f2f;border:1px solid #44677b;padding:22px;margin:25px 0}.r21-calc-header{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:15px}.r21-calc-header h3{margin:0}.r21-calc-header span{font-size:.75rem;color:#9fbfca}.r21-input-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.r21-input-grid label{font-size:.77rem;color:#bad0db;display:grid;gap:5px}.r21-input-grid input{width:100%;min-width:0;height:47px;padding:10px 12px;border-radius:9px;background:#071523;color:#fff;border:1px solid #405c6e;font-size:1rem}.r21-input-grid input:focus{border-color:#adf1f9}.r21-calc-help{font-size:.76rem;color:#9aafc0}.r21-results{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin:20px 0}.r21-results>div{background:#091a2b;border:1px solid #2e4e67;border-radius:10px;padding:15px;min-width:0}.r21-results span{font-size:.72rem;line-height:1.4;color:#a6c2ce;display:block}.r21-results strong{font-size:clamp(1.1rem,2vw,1.55rem);display:block;margin-top:8px;overflow-wrap:anywhere}.r21-calc-footer{display:flex;justify-content:space-between;align-items:center;gap:12px}.r21-calc-footer p{font-size:.72rem;max-width:460px;color:#98b2c3}.r21-fixes details,.r21-faq details{border-bottom:1px solid #294357;padding:14px 0}.r21-fixes summary,.r21-faq summary{cursor:pointer;color:#e7f5fc;font-weight:700;padding-right:20px;position:relative}.r21-fixes summary:after,.r21-faq summary:after{content:"+";position:absolute;right:0;color:#cff277;font-size:1.35rem;line-height:1}.r21-fixes details[open] summary:after,.r21-faq details[open] summary:after{content:"−"}.r21-fixes details p,.r21-faq details p{color:#acbfce;margin:.75rem 0}.r21-sources{font-size:.85rem;padding-left:1.3rem;word-break:break-word}.r21-sources li{margin:10px 0}.r21-link-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.r21-link-grid a{display:grid;gap:6px;background:#122436;border:1px solid #294c62;padding:16px 18px;border-radius:12px;text-decoration:none!important}.r21-link-grid span{color:#b3d67e;font-weight:850;letter-spacing:.12em;font-size:.67rem}.r21-link-grid strong{font-size:.92rem;line-height:1.36}.r21-link-grid small{color:#a5bccb}.r21-footer{border-top:1px solid #264053;background:#081522;padding:33px 0 44px}.r21-footer .r21-shell{display:flex;flex-wrap:wrap;gap:15px 25px;align-items:center}.r21-footer p{font-size:.85rem;color:#9fb6c9;margin:0;flex:1 1 200px}.r21-footer nav{display:flex;gap:18px;flex-wrap:wrap}.r21-footer nav a{font-size:.78rem}.r21-footer small{width:100%;color:#7399ad}.r21-mobile-toc{display:none}@media(max-width:1000px){.r21-hero{grid-template-columns:1fr;gap:25px;padding-bottom:50px}.r21-hero h1{max-width:21ch}.r21-hero-media{max-width:780px}.r21-body-layout{grid-template-columns:180px minmax(0,1fr);gap:38px}.r21-sticky nav a{font-size:.74rem}}@media(max-width:760px){.r21-shell,.r21-nav{width:min(100% - 32px,700px)}.r21-nav{flex-wrap:wrap;gap:0;padding:10px 0;min-height:60px}.r21-nav-links{width:100%;gap:18px;order:2;padding:5px 0 3px}.r21-header{position:relative}.r21-hero{padding-top:23px;padding-bottom:36px}.r21-hero h1{font-size:clamp(2.15rem,8.5vw,3.15rem);max-width:17ch}.r21-hero-cta{display:grid}.r21-btn{width:100%}.r21-body-layout{display:block}.r21-aside{display:none}.r21-mobile-toc{display:block;margin-bottom:36px}.r21-mobile-toc details{border:1px solid #36526a;border-radius:11px;background:#122538;padding:12px 16px}.r21-mobile-toc summary{cursor:pointer;font-weight:750}.r21-mobile-toc nav{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:12px}.r21-mobile-toc a{font-size:.74rem;text-decoration:none!important}.r21-section{padding:34px 0 45px}.r21-statgrid,.r21-results{grid-template-columns:1fr 1fr}.r21-statgrid>div:last-child,.r21-results>div:last-child{grid-column:1/-1}.r21-choice-grid,.r21-link-grid{grid-template-columns:1fr}.r21-lab-cta{flex-direction:column;align-items:stretch}.r21-calc-footer{flex-wrap:wrap}.r21-calc-footer .r21-btn{width:100%}.r21-table-wrap table{font-size:.78rem}.r21-steps li{padding-left:51px}.r21-date{line-height:1.5}}@media(max-width:460px){.r21-input-grid{grid-template-columns:1fr}.r21-statgrid{grid-template-columns:1fr 1fr}.r21-statgrid>div{padding:13px}.r21-results{grid-template-columns:1fr}.r21-results>div:last-child{grid-column:auto}.r21-calc{padding:14px}.r21-calc-header{display:block}.r21-hero-cta{gap:9px}.r21-answer{padding:18px}.r21-mobile-toc nav{grid-template-columns:1fr}.r21-prompt pre{padding:13px;font-size:.71rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.r21-btn{transition:none}.r21-btn:hover{transform:none}}